Line data Source code
1 : /*
2 : * ALSA input and output
3 : * Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
4 : * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
5 : *
6 : * This file is part of FFmpeg.
7 : *
8 : * FFmpeg is free software; you can redistribute it and/or
9 : * modify it under the terms of the GNU Lesser General Public
10 : * License as published by the Free Software Foundation; either
11 : * version 2.1 of the License, or (at your option) any later version.
12 : *
13 : * FFmpeg is distributed in the hope that it will be useful,
14 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 : * Lesser General Public License for more details.
17 : *
18 : * You should have received a copy of the GNU Lesser General Public
19 : * License along with FFmpeg; if not, write to the Free Software
20 : * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 : */
22 :
23 : /**
24 : * @file
25 : * ALSA input and output: common code
26 : * @author Luca Abeni ( lucabe72 email it )
27 : * @author Benoit Fouet ( benoit fouet free fr )
28 : * @author Nicolas George ( nicolas george normalesup org )
29 : */
30 :
31 : #include <alsa/asoundlib.h>
32 : #include "avdevice.h"
33 : #include "libavutil/avassert.h"
34 : #include "libavutil/channel_layout.h"
35 :
36 : #include "alsa.h"
37 :
38 0 : static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
39 : {
40 0 : switch(codec_id) {
41 0 : case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE;
42 0 : case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE;
43 0 : case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE;
44 0 : case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE;
45 0 : case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE;
46 0 : case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE;
47 0 : case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE;
48 0 : case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE;
49 0 : case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE;
50 0 : case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE;
51 0 : case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE;
52 0 : case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE;
53 0 : case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
54 0 : case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
55 0 : case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE;
56 0 : case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE;
57 0 : case AV_CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8;
58 0 : case AV_CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8;
59 0 : case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW;
60 0 : case AV_CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW;
61 0 : default: return SND_PCM_FORMAT_UNKNOWN;
62 : }
63 : }
64 :
65 : #define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP) \
66 : static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v, \
67 : void *out_v, \
68 : int n) \
69 : { \
70 : const TYPE *in = in_v; \
71 : TYPE *out = out_v; \
72 : \
73 : while (n-- > 0) { \
74 : MAP \
75 : in += CHANNELS; \
76 : out += CHANNELS; \
77 : } \
78 : }
79 :
80 : #define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \
81 : MAKE_REORDER_FUNC(int8, int8_t, CHANNELS, LAYOUT, MAP) \
82 : MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \
83 : MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \
84 : MAKE_REORDER_FUNC(f32, float, CHANNELS, LAYOUT, MAP)
85 :
86 0 : MAKE_REORDER_FUNCS(5, out_50, \
87 : out[0] = in[0]; \
88 : out[1] = in[1]; \
89 : out[2] = in[3]; \
90 : out[3] = in[4]; \
91 : out[4] = in[2]; \
92 : )
93 :
94 0 : MAKE_REORDER_FUNCS(6, out_51, \
95 : out[0] = in[0]; \
96 : out[1] = in[1]; \
97 : out[2] = in[4]; \
98 : out[3] = in[5]; \
99 : out[4] = in[2]; \
100 : out[5] = in[3]; \
101 : )
102 :
103 0 : MAKE_REORDER_FUNCS(8, out_71, \
104 : out[0] = in[0]; \
105 : out[1] = in[1]; \
106 : out[2] = in[4]; \
107 : out[3] = in[5]; \
108 : out[4] = in[2]; \
109 : out[5] = in[3]; \
110 : out[6] = in[6]; \
111 : out[7] = in[7]; \
112 : )
113 :
114 : #define FORMAT_I8 0
115 : #define FORMAT_I16 1
116 : #define FORMAT_I32 2
117 : #define FORMAT_F32 3
118 :
119 : #define PICK_REORDER(layout)\
120 : switch(format) {\
121 : case FORMAT_I8: s->reorder_func = alsa_reorder_int8_out_ ##layout; break;\
122 : case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\
123 : case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\
124 : case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout; break;\
125 : }
126 :
127 0 : static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out)
128 : {
129 : int format;
130 :
131 : /* reordering input is not currently supported */
132 0 : if (!out)
133 0 : return AVERROR(ENOSYS);
134 :
135 : /* reordering is not needed for QUAD or 2_2 layout */
136 0 : if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2)
137 0 : return 0;
138 :
139 0 : switch (codec_id) {
140 0 : case AV_CODEC_ID_PCM_S8:
141 : case AV_CODEC_ID_PCM_U8:
142 : case AV_CODEC_ID_PCM_ALAW:
143 0 : case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8; break;
144 0 : case AV_CODEC_ID_PCM_S16LE:
145 : case AV_CODEC_ID_PCM_S16BE:
146 : case AV_CODEC_ID_PCM_U16LE:
147 0 : case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break;
148 0 : case AV_CODEC_ID_PCM_S32LE:
149 : case AV_CODEC_ID_PCM_S32BE:
150 : case AV_CODEC_ID_PCM_U32LE:
151 0 : case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break;
152 0 : case AV_CODEC_ID_PCM_F32LE:
153 0 : case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break;
154 0 : default: return AVERROR(ENOSYS);
155 : }
156 :
157 0 : if (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0)
158 0 : PICK_REORDER(50)
159 0 : else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1)
160 0 : PICK_REORDER(51)
161 0 : else if (layout == AV_CH_LAYOUT_7POINT1)
162 0 : PICK_REORDER(71)
163 :
164 0 : return s->reorder_func ? 0 : AVERROR(ENOSYS);
165 : }
166 :
167 0 : av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
168 : unsigned int *sample_rate,
169 : int channels, enum AVCodecID *codec_id)
170 : {
171 0 : AlsaData *s = ctx->priv_data;
172 : const char *audio_device;
173 0 : int res, flags = 0;
174 : snd_pcm_format_t format;
175 : snd_pcm_t *h;
176 : snd_pcm_hw_params_t *hw_params;
177 : snd_pcm_uframes_t buffer_size, period_size;
178 0 : uint64_t layout = ctx->streams[0]->codecpar->channel_layout;
179 :
180 0 : if (ctx->url[0] == 0) audio_device = "default";
181 0 : else audio_device = ctx->url;
182 :
183 0 : if (*codec_id == AV_CODEC_ID_NONE)
184 0 : *codec_id = DEFAULT_CODEC_ID;
185 0 : format = codec_id_to_pcm_format(*codec_id);
186 0 : if (format == SND_PCM_FORMAT_UNKNOWN) {
187 0 : av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
188 0 : return AVERROR(ENOSYS);
189 : }
190 0 : s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;
191 :
192 0 : if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
193 0 : flags = SND_PCM_NONBLOCK;
194 : }
195 0 : res = snd_pcm_open(&h, audio_device, mode, flags);
196 0 : if (res < 0) {
197 0 : av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
198 : audio_device, snd_strerror(res));
199 0 : return AVERROR(EIO);
200 : }
201 :
202 0 : res = snd_pcm_hw_params_malloc(&hw_params);
203 0 : if (res < 0) {
204 0 : av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
205 : snd_strerror(res));
206 0 : goto fail1;
207 : }
208 :
209 0 : res = snd_pcm_hw_params_any(h, hw_params);
210 0 : if (res < 0) {
211 0 : av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
212 : snd_strerror(res));
213 0 : goto fail;
214 : }
215 :
216 0 : res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
217 0 : if (res < 0) {
218 0 : av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
219 : snd_strerror(res));
220 0 : goto fail;
221 : }
222 :
223 0 : res = snd_pcm_hw_params_set_format(h, hw_params, format);
224 0 : if (res < 0) {
225 0 : av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
226 : *codec_id, format, snd_strerror(res));
227 0 : goto fail;
228 : }
229 :
230 0 : res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
231 0 : if (res < 0) {
232 0 : av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
233 : snd_strerror(res));
234 0 : goto fail;
235 : }
236 :
237 0 : res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
238 0 : if (res < 0) {
239 0 : av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
240 : channels, snd_strerror(res));
241 0 : goto fail;
242 : }
243 :
244 0 : snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
245 0 : buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX);
246 : /* TODO: maybe use ctx->max_picture_buffer somehow */
247 0 : res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
248 0 : if (res < 0) {
249 0 : av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
250 : snd_strerror(res));
251 0 : goto fail;
252 : }
253 :
254 0 : snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
255 0 : if (!period_size)
256 0 : period_size = buffer_size / 4;
257 0 : res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
258 0 : if (res < 0) {
259 0 : av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
260 : snd_strerror(res));
261 0 : goto fail;
262 : }
263 0 : s->period_size = period_size;
264 :
265 0 : res = snd_pcm_hw_params(h, hw_params);
266 0 : if (res < 0) {
267 0 : av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
268 : snd_strerror(res));
269 0 : goto fail;
270 : }
271 :
272 0 : snd_pcm_hw_params_free(hw_params);
273 :
274 0 : if (channels > 2 && layout) {
275 0 : if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) {
276 : char name[128];
277 0 : av_get_channel_layout_string(name, sizeof(name), channels, layout);
278 0 : av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n",
279 : name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
280 : }
281 0 : if (s->reorder_func) {
282 0 : s->reorder_buf_size = buffer_size;
283 0 : s->reorder_buf = av_malloc_array(s->reorder_buf_size, s->frame_size);
284 0 : if (!s->reorder_buf)
285 0 : goto fail1;
286 : }
287 : }
288 :
289 0 : s->h = h;
290 0 : return 0;
291 :
292 0 : fail:
293 0 : snd_pcm_hw_params_free(hw_params);
294 0 : fail1:
295 0 : snd_pcm_close(h);
296 0 : return AVERROR(EIO);
297 : }
298 :
299 0 : av_cold int ff_alsa_close(AVFormatContext *s1)
300 : {
301 0 : AlsaData *s = s1->priv_data;
302 :
303 0 : snd_pcm_nonblock(s->h, 0);
304 0 : snd_pcm_drain(s->h);
305 0 : av_freep(&s->reorder_buf);
306 : if (CONFIG_ALSA_INDEV)
307 0 : ff_timefilter_destroy(s->timefilter);
308 0 : snd_pcm_close(s->h);
309 0 : return 0;
310 : }
311 :
312 0 : int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
313 : {
314 0 : AlsaData *s = s1->priv_data;
315 0 : snd_pcm_t *handle = s->h;
316 :
317 0 : av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
318 0 : if (err == -EPIPE) {
319 0 : err = snd_pcm_prepare(handle);
320 0 : if (err < 0) {
321 0 : av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
322 :
323 0 : return AVERROR(EIO);
324 : }
325 0 : } else if (err == -ESTRPIPE) {
326 0 : av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
327 :
328 0 : return -1;
329 : }
330 0 : return err;
331 : }
332 :
333 0 : int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
334 : {
335 0 : int size = s->reorder_buf_size;
336 : void *r;
337 :
338 0 : av_assert0(size != 0);
339 0 : while (size < min_size)
340 0 : size *= 2;
341 0 : r = av_realloc_array(s->reorder_buf, size, s->frame_size);
342 0 : if (!r)
343 0 : return AVERROR(ENOMEM);
344 0 : s->reorder_buf = r;
345 0 : s->reorder_buf_size = size;
346 0 : return 0;
347 : }
348 :
349 : /* ported from alsa-utils/aplay.c */
350 0 : int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
351 : {
352 0 : int ret = 0;
353 : void **hints, **n;
354 0 : char *name = NULL, *descr = NULL, *io = NULL, *tmp;
355 0 : AVDeviceInfo *new_device = NULL;
356 0 : const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input";
357 :
358 0 : if (snd_device_name_hint(-1, "pcm", &hints) < 0)
359 0 : return AVERROR_EXTERNAL;
360 0 : n = hints;
361 0 : while (*n && !ret) {
362 0 : name = snd_device_name_get_hint(*n, "NAME");
363 0 : descr = snd_device_name_get_hint(*n, "DESC");
364 0 : io = snd_device_name_get_hint(*n, "IOID");
365 0 : if (!io || !strcmp(io, filter)) {
366 0 : new_device = av_mallocz(sizeof(AVDeviceInfo));
367 0 : if (!new_device) {
368 0 : ret = AVERROR(ENOMEM);
369 0 : goto fail;
370 : }
371 0 : new_device->device_name = av_strdup(name);
372 0 : if ((tmp = strrchr(descr, '\n')) && tmp[1])
373 0 : new_device->device_description = av_strdup(&tmp[1]);
374 : else
375 0 : new_device->device_description = av_strdup(descr);
376 0 : if (!new_device->device_description || !new_device->device_name) {
377 0 : ret = AVERROR(ENOMEM);
378 0 : goto fail;
379 : }
380 0 : if ((ret = av_dynarray_add_nofree(&device_list->devices,
381 : &device_list->nb_devices, new_device)) < 0) {
382 0 : goto fail;
383 : }
384 0 : if (!strcmp(new_device->device_name, "default"))
385 0 : device_list->default_device = device_list->nb_devices - 1;
386 0 : new_device = NULL;
387 : }
388 0 : fail:
389 0 : free(io);
390 0 : free(name);
391 0 : free(descr);
392 0 : n++;
393 : }
394 0 : if (new_device) {
395 0 : av_free(new_device->device_description);
396 0 : av_free(new_device->device_name);
397 0 : av_free(new_device);
398 : }
399 0 : snd_device_name_free_hint(hints);
400 0 : return ret;
401 : }
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